Test import path cleanup

This is cleaning up the mix of relative and absolute paths in the test imports. By moving all of these to absolute paths, we can correct the issue with the export_test.go files. These really should end in "_test" rather than "_fortest" as naming them "_fortest" includes them in the compiled package, exposing the unexported properties to any consumer of the package rather than just tests, which defeats the purpose of making them unexported properties to begin with.